Gymnastics Super Mat 2' Panel 4'X8'X2" with Hook/Loop V-4 Blue Cross-linked Polyethylene foam renowned for its shock absorption resiliency and fast response It's proven to substantially outlast non cross-linked foam as its cell structure will not break down under repeated bending or compression. Light weight 18 oz. Knife-coated Vinyl Cover. THIS MAT HAS VELCRO ON ALL 4 SIDES FOR THE ABILITY TO ATTACH MULTIPLE MATS TOGETHER. Double-reinforced nylon stitching with inverted seams